The genus Coleus (Lamiaceae) in Central Africa (Democratic Republic of the Congo, Rwanda, Burundi), with the description of 15 new species Author Meerts, Pierre J. 0000-0003-4215-027X Meise Botanic Garden, Nieuwelaan 38, BE- 1860 Meise, Belgium & Université Libre de Bruxelles, Av. F. D. Roosevelt 50 CP 244, BE- 1050 Brussels, Belgium & Fédération Wallonie-Bruxelles, Service général de l’Enseignement supérieur et de la Recherche scientifique, Brussels, Belgium Author Paton, Alan J. 0000-0002-6052-6675 The Herbarium, Royal Botanic Gardens, Kew, Richmond TW 9 3 AB, UK text PhytoKeys 2024 2024-09-02 246 71 178 journal article 302074 10.3897/phytokeys.246.129476 b381880a-e0bb-4b02-ad0f-2f90a0b6c995 Coleus rotundifolius (Poir.) A. Chev. & Perrot , Veg. Ut. Afr. Trop. Franç. 1: 101. 1905 . ≡ Germanea rotundifolia Poir. in J. B . A. M . de Lamarck, Encycl. 2: 763. 1788. ≡ Plectranthus rotundifolius (Poir.) Spreng. , Syst. Veg., ed. 16. 2: 690 (1825). Type: Mauritius (“ Isle de France ”), P. Commerson s. n. ( holotype P [P 00152706]; isotype FI ). Description. Paton et al. (2009: 330) ; Paton et al. (2013: 269) , as Plectranthus rotundifolius (Poir.) Spreng. Habitat and ecology. Fallow field; ca. 400 m ; in Africa, always in cultivation or as a relic of old cultivation. Additional specimens. DR. Congo , Bas-Congo , Kasangulu, 22 Apr 1960 , P. Compère 1991 ( BR ). Rwanda , Nyabarsingo, Simpson s. n . ( TCD , not seen, cited in Suddee et al. 2004 ). Notes. 1. New species record for DR. Congo . 2. This species belongs in the difficult group of C. bojeri - C. welwitschii , in which identification requires carefully collected underground organs. The collecting notes on the label of P. Compère 1991 mention the presence of tubers, but these have not been collected. Apart from tubers, the species differs from C. bojeri in having somewhat thicker and more pubescent leaves. 3. See note under C. welwitschii .